40010121 has 6 divisors (see below), whose sum is σ = 57792410. Its totient is φ = 26673408.

The previous prime is 40010101. The next prime is 40010123. The reversal of 40010121 is 12101004.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 39200121 + 810000 = 6261^2 + 900^2 .

It is not a de Polignac number, because 40010121 - 2¹⁰ = 40009097 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 4445569 = 40010121 / (4 + 0 + 0 + 1 + 0 + 1 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40010123) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2222776 + ... + 2222793.

Almost surely, 2^40010121 is an apocalyptic number.

It is an amenable number.

40010121 is a deficient number, since it is larger than the sum of its proper divisors (17782289).

40010121 is a wasteful number, since it uses less digits than its factorization.

40010121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4445575 (or 4445572 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 40010121 is about 6325.3554050346. The cubic root of 40010121 is about 342.0240313472.

Adding to 40010121 its reverse (12101004), we get a palindrome (52111125).

The spelling of 40010121 in words is "forty million, ten thousand, one hundred twenty-one".